When using the Amadeus Pro "Join Files" command to connect Mp3 files, are they converted to WAV? Does Amadeus Pro ALWAYS convert Mp3s to WAV files to edit or even just normalize their gain? Are Mp3s converted to WAV when their sample rate is converted from xx kbps to a lower rate?

Is there anything Amadeus Pro allows us to do with Mp3s that does not first convert them to WAV files? Thanks.